Galaxy S4 Google Edition: 5.0 How to find/set credential password?

The upgrade to 5.0 disabled my work exchange email. You now have to add it as an additional account under gmail. Tried doing that but it requires the "credential storage" password. I can find credential storage under personal/security but there is no option there to set/change anything. The clear credentials option is not available. Could anyone share how to locate/change? Thanks